Recording/reproducing device

ABSTRACT

The present invention relates to a recording and/or reproduction apparatus and a program suitable for use to record or reproduce data onto or from an optical disk having two recording layers on one side thereof. 
     In an optical disk which has, on one side thereof, two layers including a recording film L 0  layer in an unformatted state and another recording film L 1  layer in a formatted state, the recording film L 0  layer is formatted with marks at step S 1 , and formation of marks corresponding to recording data is started beginning with the recording film L 0  layer at step S 2 . After the recording film L 0  layer is used up, marks corresponding to recording data are formed on the recording film L 1  layer at step S 3 . The present invention can be applied, for example, to a DVD player.

TECHNICAL FIELD

This invention relates to a recording and/or reproduction apparatus, andmore particularly to a recording and/or reproduction apparatus suitablefor use to record and/or reproduce data onto and/or from an optical diskhaving two recording layers on one side thereof.

BACKGROUND ART

Development of a two-layer recording-reproduction optical disk wherein arecording film of two layers is provided on one side of an optical diskto increase the recording capacity per one side to twice is proceeding.

In the two-layer recording-reproduction optical disk, as shown in asectional view of FIG. 1, a recording film L1 layer for recording data,a space layer, another recording film L0 layer for recording data and acover layer for protecting the recording film L0 layer and the otherlayers below the recording film L0 layer are formed in an overlappingrelationship with each other on a substrate of polycarbonate or thelike. It is to be noted that an optical pickup (not shown) forirradiating a laser beam upon and receiving reflected light of the laserbeam from the two-layer recording-reproduction optical disk ispositioned at an upper location in the drawing. In the followingdescription, where it is not necessary to distinguish the recording filmL0 layer and the recording film L1 layer from each other, any of thelayers may be referred to merely as recording layer.

In order to record data on a recording layer of a two-layerrecording-reproduction optical disk, it is necessary to divide therecording layer into sectors of 2,048 (=2 K) bytes which are units forrecording and reproduction and record a sector address into the headerof each sector, that is, to perform a formatting process for therecording layer.

As a method of recording sector addresses and data on a recording layer,a method of forming pits (small holes) by stamping or the like in aprocess of production of a two-layer recording-reproduction optical diskand another method of irradiating a laser beam upon a recording layer ofa completed two-layer recording-reproduction optical disk to recordmarks (phase transition regions) are known. It is to be noted that a pitformed in a process of production of a two-layer recording-reproductionoptical disk is hereinafter referred to as embossed pit.

In order to record or read out a mark onto or from the recording film L1layer of the two-layer recording-reproduction optical disk, a laser beamfrom the optical pickup is irradiated upon the recording film L1 layerthrough the recording film L0 layer or reflected light from therecording film L1 layer is received by the optical pickup through therecording film L0 layer as seen in FIG. 1.

Incidentally, a portion of a recording film at which an embossed pit ora mark is recorded has a different transmission factor or reflectionfactor with respect to a laser beam when compared with another portionof the recording film at which an embossed pit or a mark is notrecorded.

Accordingly, when a laser beam is irradiated upon the recording film L1layer through the recording film L0 layer or reflected light from therecording film L1 layer is received through the recording film L0 layer,a variation or an offset in amplitude occurs with the irradiation lightor the reflection light in response to presence or absence of anembossed pit or a mark on the recording film L0 layer through which thelaser light or the reflected light passes. Therefore, there is a subjectto be solved that it is difficult to record or reproduce a mark with ahigh degree of accuracy onto or from the recording film L1 layer.

DISCLOSURE OF INVENTION

The present invention has been made in view of such a situation asdescribed above, and it is an object of the present invention to make itpossible to record or reproduce a mark with a high degree of accuracyonto or from a recording film L0 layer and another recording film L1layer of a two-layer recording-reproduction optical disk.

A recording and/or reproduction apparatus of the present invention ischaracterized in that it includes recording means for irradiating alaser beam upon an optical disk to record marks onto a first or secondrecording layer, light receiving means for receiving reflected lightfrom the optical disk when the laser beam is irradiated upon the opticaldisk, data signal production means for producing a data signal based onthe reflected light received by the light receiving means, and controlmeans for controlling the recording means to record the marks onto theentire first recording layer prior to the second recording layer.

The optical disk may be formed such that the laser beam irradiated uponthe second recording layer and the reflected light from the secondrecording layer pass through the first recording layer.

The control means may control the recording means to record the markscorresponding to recording data inputted thereto onto the entire firstrecording layer prior to the second recording layer.

The control means may control the recording means to record the dummymarks onto the entire first recording layer after formatting for thefirst recording layer is completed.

Wobbles may be formed on tracks of the first and second recording layersof the optical disk.

The recording and/or reproduction apparatus of the present invention mayfurther include wobble signal production means for producing a wobblesignal corresponding to the wobbles formed on the tracks based on thereflected light signal, and adjustment means for adjusting asynchronizing signal based on the wobble signal.

A recording and/or reproduction method of the present invention ischaracterized in that it comprises a recording step of irradiating alaser beam upon an optical disk to record marks onto a first or secondrecording layer, a light receiving step of receiving reflected lightfrom the optical disk when the laser beam is irradiated upon the opticaldisk, a data signal production step of producing a data signal based onthe reflected light received by the process of the light receiving step,and a control step of controlling the process of the recording step torecord the marks onto the entire first recording layer prior to thesecond recording layer.

A program of a recording medium of the present invention ischaracterized in that it comprises a recording step of irradiating alaser beam upon the optical disk to record marks onto the first orsecond recording layer, a light receiving step of receiving reflectedlight from the optical disk when the laser beam is irradiated upon theoptical disk, a data signal production step of producing a data signalbased on the reflected light received by the process of the lightreceiving step, and a control step of controlling the process of therecording step to record the marks onto the entire first recording layerprior to the second recording layer.

A program of the present invention is characterized in that it causes acomputer to execute a recording step of irradiating a laser beam uponthe optical disk to record marks onto the first or second recordinglayer, a light receiving step of receiving reflected light from theoptical disk when the laser beam is irradiated upon the optical disk, adata signal production step of producing a data signal based on thereflected light received by the process of the light receiving step, anda control step of controlling the process of the recording step torecord the marks onto the entire first recording layer prior to thesecond recording layer.

With the recording and/or reproduction apparatus and method as well asthe program of the present invention, a laser beam is irradiated upon anoptical disk to form marks on a first or second recording layer.Further, reflected light from the optical disk when the laser beam isirradiated upon the optical disk is received, and a data signal isproduced based on the received reflected light. Furthermore, a recordingprocess is controlled to record marks on the entire first recordinglayer prior to the second recording layer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a two-layer recording-reproduction opticaldisk;

FIG. 2 is a view illustrating a structure of a two-layerrecording-reproduction optical disk 1;

FIG. 3 is a view showing a data structure of a header;

FIG. 4 is a view showing a recording film L0 layer of the two-layerrecording-reproduction optical disk 1 in an unformatted state;

FIG. 5 is a view showing a recording film L1 layer of the two-layerrecording-reproduction optical disk 1 in an unformatted state;

FIG. 6 is a block diagram showing an example of a configuration of anoptical disk drive of an embodiment of the present invention;

FIG. 7 is a block diagram showing an example of a configuration of awobbling circuit 12;

FIG. 8 is a block diagram showing a first example of a configuration ofa header area detection circuit 14;

FIG. 9 is a view illustrating operation by the first example of theconfiguration of the header area detection circuit 14;

FIG. 10 is a block diagram showing a second example of a configurationof the header area detection circuit 14;

FIG. 11 is a view illustrating operation by the second example of theconfiguration of the header area detection circuit 14;

FIG. 12 is a view showing a configuration of an error correction block;

FIG. 13 is a view showing an ECC block cluster;

FIG. 14 is a flow chart illustrating a recording process of the opticaldisk drive;

FIG. 15A is a view showing the optical disk 1 in an unformatted state;

FIG. 15B is a view showing the optical disk 1 wherein a header isrecorded on the recording film L0 layer;

FIG. 15C is a view showing the optical disk 1 wherein data are recordedon the entire recording film L0 layer;

FIG. 15D is a view showing the optical disk 1 wherein data are recordedalso on the recording film L1 layer;

FIG. 16 is a view showing the recording film L0 layer of the opticaldisk 1 in a formatted state;

FIG. 17 is a view illustrating land groove recording; and

FIG. 18 is a view illustrating groove recording.

BEST MODE FOR CARRYING OUT THE INVENTION

In the following, an optical disk drive of an embodiment of the presentinvention is described. However, before the optical disk drive isdescribed, a two-layer recording-reproduction optical disk 1 to beloaded into the optical disk drive (FIG. 6) so that data are recordedonto it is described with reference to FIGS. 2 to 5.

The optical disk (hereinafter referred to simply as optical disk) 1includes a substrate, a recording film L1 layer, a space layer, arecording film L0 layer and a cover layer placed one on another in thisorder as shown in FIG. 1.

FIG. 2 shows a recording layer (the recording film L0 layer and therecording film L1 layer) of the optical disk 1. A spiral groove (guidegroove) wobbled with a fixed frequency is formed on the recording layersof the optical disk. Accordingly, a track formed from a groove andanother track formed from a land are formed alternately for every onecircumference. The wobbles are detected based on a pp (push pull) signaland are used to produce a synchronizing signal.

A track for one circumference of the optical disk 1 is composed of eightsegments. Each of the segments is composed of a head area in which aheader is recorded and a data area in which data are recorded.

The optical disk 1 is sectioned into n+1 zones Z₀ to Z_(n) composed of aplurality of tracks which are adjacent each other in a radial direction.The number (period) of wobbles formed on tracks which belong to the samezone is common. In particular, wobbles for 420+6i periods are formed ineach of segments in the ith (i=0, 1, . . . , n) zone Z_(i) from theinner side. Accordingly, wobbles for 8×(420+6i) periods are formed onthe tracks which belong to the zone Z_(i).

For example, in each segment in the zone Z₀ of the innermostcircumference, wobbles for 420 periods are formed. Accordingly, on thetracks which belong to the zone Z₀, wobbles for 3,360 (=420×8) periodsare formed. Meanwhile, for example, in each segment of the third (i=2)zone Z₂, wobbles for 432 (=420+6×2) periods are formed. Accordingly,wobbles for 3,456 (=8×(420+6×2)) periods are formed on the tracks whichbelong to the zone Z₂.

The wavelengths of the wobbles formed on the innermost tracks in thedifferent zones are equal to one another. Addresses recorded in a headerarea are formed in a CAV (Constant Angular Velocity) state, that is, ina radial state in each zone. The densities on the innermostcircumferences in the different zones are equal to one another.

FIG. 3 illustrates a configuration of information of 1,080 ch recordedwith embossed pits or marks in a header area of a segment.

A segment mark SM1 of 60 ch is a unique pattern representing that it isa header. VFO1 of 414 ch is a continuous data pattern for PLL (PhaseLocked Loop) pull-in. A preamble PrA1 of 30 ch is a pattern forautomatic gain control and offset control. An address mark AM1 of 21 chis a pattern representative of the top of ID1 which indicates anaddress. The address ID1 of 102 ch indicates a track address, a segmentaddress and a CRC (Cyclic Redundancy Check) code. A postamble PoA1 of 6ch is a pattern for causing the address ID1 to satisfy a channel codingrule.

VFO2 of 288 ch is a continuous data pattern for PLL pull-in. A preamblePrA2 of 30 ch is a pattern for automatic gain control and offsetcontrol. An address mark AM2 of 21 ch is a pattern representative of thetop of ID2 representative of an address. The address ID2 of 102 chindicates a track address, a segment address and a CRC code. A postamblePoA2 of 6 ch is a pattern for causing the address ID2 to satisfy achannel coding rule.

The address ID1 and the address ID2 are provided in the header area.Accordingly, an address is recorded doubly in the header area.

FIG. 4 shows a header area and data areas around the header area of therecording film L0 layer of the optical disk 1 for which a formattingprocess has not been performed by the optical disk drive to which thepresent invention is applied. As shown in FIG. 4, wobbles immediatelyprior to a header area are formed such that their phase is reversed twoperiods before the header area. In the header area, a header address byembossed pits or marks is not recorded as yet. In the followingdescription, a header area in a state wherein no embossed pit or no markis recorded is referred to as mirror mark.

FIG. 5 shows a header area and data areas around the header area of therecording film L1 layer of the optical disk 1 for which a formattingprocess has not been performed by the optical disk drive to which thepresent invention is applied. As shown in FIG. 5, wobbles immediatelyprior to a header area are formed such that their phase is reversed twoperiods before the header area. On a land of the header area, a headeraddress by embossed pits is formed. Meanwhile, on a groove of the headerarea, a groove header by embossed pits is formed such that it does notneighbor with a land header in a radial direction.

As can be seen apparently from comparison between FIGS. 4 and 5, nothingis recorded in the header areas of the recording film L0 layer whichcomposes the optical disk 1 before a formatting process is performedtherefor by the optical disk drive to which the present invention isapplied. However, on the recording film L1 layer, land headers andgroove headers by embossed pits are formed in the header areas. In otherwords, the recording film L0 layer which composes the optical disk 1remains in an unformatted state while the recording film L1 layer isformatted in the process of production of the optical disk 1.

In the following, an example of a configuration of the optical diskdrive which records or reproduces data onto or from the optical disk 1described above is described with reference to FIG. 6.

In the optical disk drive shown, a control circuit 2 controls componentsof the optical disk drive based on a controlling program of a recordingmedium 16. More particularly, the control circuit 2 controls thecomponents of the optical disk drive in accordance with a recordingcommand inputted from an external AV apparatus or the like (not shown)through an AV interface 3 to record marks corresponding to recordingdata inputted from the AV apparatus or the like onto the optical disk 1.Further, the control circuit 2 controls the components of the opticaldisk drive in accordance with a reproduction command inputted from theexternal AV apparatus or the like through the AV interface 3 to read outmarks recorded on the optical disk 1 to reproduce the recorded data andoutput the reproduced data to the external AV apparatus or the likethrough the AV interface 3.

A spindle circuit 4 controls rotation of a spindle motor 6 in accordancewith an instruction from the control circuit 2. A servo circuit 5controls an optical pickup 7 to seek an address designated by thecontrol circuit 2 and controls focusing servoing and tracking servoingof the optical pickup 7 in accordance with a focusing error signal and atracking error signal inputted from an optical head circuit 8. Thespindle motor 6 drives the optical disk 1 to rotate under the control ofthe spindle circuit 4.

The optical pickup 7 including a laser outputting system, a reflectedlight receiving system, a two-axis actuator and so forth irradiates,upon recording, a laser beam upon a recording layer of the optical disk1 to form marks on the recording layer under the control of the opticalhead circuit 8. Further, upon recording and reproduction, the opticalpickup 7 irradiates a laser beam upon a recording layer of the opticaldisk 1, receives reflected light of the laser beam from the recordinglayer of the optical disk 1 to produce a corresponding reflection lightsignal, and outputs the reflection light signal to the optical headcircuit 8.

The optical head circuit 8 controls, upon recording, the laser beamoutput of the optical pickup 7 in accordance with a header signal or arecording-compensated binary signal inputted from a recording andreproduction circuit 9. Upon reproduction, the optical head circuit 8produces an RF signal corresponding to embossed pits or marks recordedon the optical disk 1 based on the reflection light signal from theoptical pickup 7 and outputs the RF signal to the recording andreproduction circuit 9. Further, upon recording and reproduction, theoptical head circuit 8 produces and outputs a focusing error signal anda tracking error signal based on the reflection light signal from theoptical pickup 7 to the servo circuit 5, and produces and outputs a ppsignal to a wobbling circuit 12 and a header area detection circuit 14.

The recording and reproduction circuit 9 supplies, upon formatting, aheader signal inputted thereto from an address encoder (ENC) 15 to theoptical head circuit 8 under the control of the control circuit 2. Onthe other hand, upon recording, the recording and reproduction circuit 9performs recording compensation for a binary signal from amodulation-demodulation circuit 10 and supplies a resulting signal tothe optical head circuit 8. Further, upon reproduction, the recordingand reproduction circuit 9 converts the RF signal from the optical headcircuit 8 into binary data and supplies the binary data to themodulation-demodulation circuit 10.

The modulation-demodulation circuit 10 modulates, upon recording,recording data with error correction codes inputted from an errorcorrection circuit 11 under the control of the control circuit 2 andoutputs a resulting binary signal to the recording and reproductioncircuit 9. Further, upon reproduction, the modulation-demodulationcircuit 10 demodulates a binary signal from the recording andreproduction circuit 9 and outputs resulting reproduction data to theerror correction circuit 11.

The error correction circuit 11 adds, upon recording, ECCs (ErrorCorrection Codes) to recording data supplied from the external AVapparatus or the like through the AV interface 3 under the control ofthe control circuit 2 and outputs resulting data to themodulation-demodulation circuit 10. Further, upon reproduction, theerror correction circuit 11 corrects errors of reproduction datainputted from the modulation-demodulation circuit 10 based on ECCs andoutputs resulting data to the external AV apparatus or the like throughthe AV interface 3.

The wobbling circuit 12 produces a channel clock signal by means of aPLL mechanism built therein in accordance with the pp signal inputtedfrom the optical head circuit 8 and outputs the channel clock signal toa address decoder-timing generator (DEC•TG) 13, the header areadetection circuit 14 and the address encoder 15.

The address decoder-timing generator 13 decodes, upon reproduction, theRF signal from the optical head circuit 8 to detect an address andoutputs resulting address information to the control circuit 2 andfurther outputs a resulting wobble enable signal to the wobbling circuit12. Further, the address decoder-timing generator 13 produces a timingsignal based on a channel clock signal inputted from the wobblingcircuit 12 and supplies the timing signal to the components of theoptical disk drive through the control circuit 2.

The header area detection circuit 14 detects a header area of arecording layer based on the pp signal inputted from the optical headcircuit 8 and the channel clock signal inputted from the wobblingcircuit 12 and outputs information of the header area to the addressencoder 15.

The address encoder 15 produces, upon formatting, an address to berecorded into a header area detected by the header area detectioncircuit 14, encodes the address and outputs a resulting header signal tothe recording and reproduction circuit 9.

FIG. 7 shows an example of a configuration of the PLL mechanism of thewobbling circuit 12 for producing the clock signal.

A band-pass filter (BPF) 21 extracts only a wobble frequency componentfrom within the pp signal inputted from the optical head circuit 8 andoutputs a resulting wobble signal to a comparator 22. It is to be notedthat a high-pass filter may be used in place of the band-pass filter 21.The comparator 22 compares the wobble signal with a predeterminedthreshold value to convert the wobble signal into a binary signal andoutputs the binary signal as a PLL input signal to a gate 23.

The gate 23 outputs the PLL input from the comparator 22 in response tothe wobble enable signal from the address decoder-timing generator 13 toa phase comparator 24. The phase comparator 24 produces a phasedifference signal representative of a phase difference between the PLLinput signal inputted from the gate and a PLL reference signal inputtedfrom a frequency divider 27 and outputs the phase difference signal to alow-pass filter (LPF) 25. The low-pass filter 25 removes high frequencycomponents of the phase difference signal and outputs a resulting signalto a VCO (Voltage Controlled Oscillator) 26. The VCO 26 oscillates aclock signal with a frequency and a phase thereof adjusted so that thevoltage of the phase difference signal may be reduced to 0. Thefrequency divider 27 divides the clock signal oscillated by the VCO 26and outputs a resulting PLL reference signal to the phase comparator 24.

FIG. 8 shows a first example of a configuration of the header areadetection circuit 14. The first example of the configuration detects aheader area based on the fact that the phase of periodic waveform ofwobbles formed on a track is reversed at a timing two periods before aheader area.

A band-pass filter 31 extracts only a wobble frequency component of thepp signal inputted from the optical head circuit 8 and outputs such aresulting wobble signal as shown in the first stage of FIG. 9 to acomparator 32. It is to be noted that a high-pass filter may be used inplace of the band-pass filter 21. The comparator 32 compares the wobblesignal with a predetermined threshold value to convert the wobble signalinto such a binary signal wherein 0 and 1 appear alternately as shown inthe second stage of FIG. 9 and outputs the binary signal to a patterndetection section 34.

A frequency divider 33 divides the channel clock signal inputted fromthe wobbling circuit 12 and outputs such a resulting wobble clock signalas shown in the third stage of FIG. 9 to the pattern detection section34. The pattern detection section 34 supervises the binary signal fromthe comparator 32 in synchronism with the wobble clock signal from thefrequency divider 33 and outputs, when it detects a phase inversion ofthe wobble periodic waveform, information representing that a headerarea is present after two periods of the wobbles to the address encoder15.

FIG. 10 shows a second example of a configuration of the header areadetection circuit 14. The second example of the configuration detects aheader area based on the fact that an embossed pit or a mark is notrecorded in a header area in an unformatted state, that is, anunformatted header area is a mirror mark.

A comparator 41 compares such an RF signal acquired from the opticalhead circuit 8 as shown in the first stage of FIG. 11 with apredetermined threshold value to convert the RF signal into such abinary signal as shown in the second stage of FIG. 11 and outputs thebinary signal to a pattern detection section 42. The pattern detectionsection 42 supervises the binary signal from the comparator 41 insynchronism with such a channel clock signal inputted from the wobblingcircuit 12 as shown in the third stage of FIG. 11 and discriminates,when a state wherein the binary signal indicates one of the valuescontinues for more than a predetermined period, that a mirror mark isdetected, and outputs information indicating that a header area ispresent to the address encoder 15.

FIG. 12 shows a configuration of an error correction block. The errorcorrection block is formed for each data of 64 Kbytes. The errorcorrection block can be handled as a recording-reproduction 2 K datasector. In this instance, recording and reproduction are performed withan error correction block which includes 64 Kbytes as a unit, and anarbitrary 2 K data sector of the error correction block is recorded andreproduced. An error correction code is composed of data of 216 symbolsand a parity of 32 symbols. The error correction block is composed of304 error correction codes.

FIG. 13 shows an ECC block cluster. Referring to FIG. 13, recording andreproduction are performed in a horizontal direction. In a BIS (BurstIndicator Subcode), when successive data symbols are errors togetherwith sync which is a synchronizing signal, data symbols sandwichedbetween the sync and the BIS are regarded as burst errors and a pointeris added thereto. For the data symbols to which the pointer is added,pointer erasure correction is performed with a main correction code LCD(Long Distance Code) (248, 216, 33) illustrated in FIG. 12.

Now, a data recording process for the optical disk 1 for which aformatting process has not been performed by the optical disk drive towhich the present invention is applied is described with reference to aflow chart of FIG. 14.

It is to be noted that, in the optical disk 1 for which a formattingprocess has not been performed by the optical disk drive to which thepresent invention is applied, land headers and groove headers byembossed pits are recorded in the header areas of the recording film L1layer as shown in FIG. 15A in the process of production of the opticaldisk 1. In other words, while the recording film L0 layer of the opticaldisk 1 remains in an unformatted state, the recording film L1 layer isin a formatted state.

At step S1, the optical disk drive detects the header areas of therecording film L0 layer of the optical disk 1, records groove headerswith marks onto the groove as seen in FIG. 16 and records land headerswith marks onto the land.

More particularly, the header area detection circuit 14 detects theheader areas of the recording film L0 layer based on the pp signalinputted from the optical head circuit 8 and the channel clock signalinputted from the wobbling circuit 12 and outputs information of theheader areas to the address encoder 15, and the address encoder 15produces and encodes the addresses and outputs a resulting header signalto the recording and reproduction circuit 9. Further, the recording andreproduction circuit 9 supplies the header signal to the optical headcircuit 8, and the optical head circuit 8 controls the laser output ofthe optical pickup 7 in response to the header signal. Then, the opticalpickup 7 irradiates a laser beam under the control of the optical headcircuit 8 to record groove headers on the groove of the header areas ofthe recording film L0 layer and record land headers onto the land.

After the headers are recorded with marks into the header areas of therecording film L0 layer as shown in FIG. 15B by the process at step S1to place the optical disk 1 into a formatted state, the optical diskdrive starts, at step S2, formation of marks corresponding to recordingdata onto the recording film L0 layer and the recording film L1 layer ofthe optical disk 1 beginning with the recording film L0 layer.

More particularly, the error correction circuit 11 adds error correctioncodes to recording data inputted from the AV apparatus or the likethrough the AV interface 3, and the modulation-demodulation circuit 10modulates a resulting signal into a binary signal. Then, the recordingand reproduction circuit 9 performs recording compensation for thebinary signal, and the optical pickup 7 irradiates a laser beam underthe control of the optical head circuit 8 to form marks corresponding tothe recording data onto the recording film L0 layer.

Then, after the recording film L0 layer is used up (after marks arerecorded into all data area of the recording film L0 layer) as shown inFIG. 15C, the optical disk drive forms marks corresponding to therecording data onto the recording film L1 layer as shown in FIG. 15D.

It is to be noted that, as a method of forming marks in a data area, twomethods including a method of forming marks on both of a land and agroove as illustrated in land-groove recording in FIG. 17 and anothermethod of forming marks on only one of a land and a groove as in grooverecording illustrated in FIG. 18 are available.

As described above, with the optical disk drive to which the presentinvention is applied, at a point of time at which marks are formed onthe recording film L1 layer, marks are already formed in all of theheader areas and the data areas of the recording film L0 layer while noemboss pit is formed on the recording film L0 layer. Therefore, thetransmission factor of the recording film L0 layer is uniform.Accordingly, incoming light to the recording film L1 layer or reflectedlight from the recording film L1 layer which passes through therecording film L0 layer does not include a change or an offset of theamplitude which arises from presence or absence of marks or embossedpits, and therefore, marks corresponding to recording data can be formedonto or reproduced from the recording film L1 layer accurately.

It is to be noted that, in order to record data again onto the opticaldisk 1 whose recording film L0 layer has been placed into a formattedstate once, the processing at step S2 et seq. should be executed.

Further, dummy marks may be recorded into all of the data areas of therecording film L0 layer continuously to the processing of formatting therecording film L0 layer at step S1.

With the optical disk drive to which the present invention is applied,since a PLL is applied to a frequency based on wobbles formed on theoptical disk 1 to produce a channel clock signal, the entire opticaldisk driven can operate with a high degree of accuracy.

Further, with the optical disk drive to which the present invention isapplied, since an accurate synchronizing signal is obtained based on thewobbles, for example, even if an influence of dust or the like stickingto the surface of the optical disk 1 increases due to the fact that thecover layer is formed with such a small thickness as approximately 0.1mm to such a degree that an embossed pit or a mark is read erroneously,error correction can be executed readily.

It is to be noted that, where the optical disk drive is used as anapparatus for recording only headers with marks into the header areas ofthe recording film L0 layer of the optical disk 1 in order to sold theoptical disk 1 in a formatted state, the AV interface 3,modulation-demodulation circuit 10 and error correction circuit 11 canbe removed from the example of the configuration shown in FIG. 6.

Incidentally, while the series of processes described above can beexecuted by hardware, it may otherwise be executed by software. Wherethe series of processes is executed by software, a program whichconstructs the software is installed from a recording medium into acomputer incorporated in hardware for exclusive use or, for example, apersonal computer for universal use which can execute various functionsby installing various programs.

The recording medium is formed as a package medium such as, as shown inFIG. 6, a magnetic disk (including a floppy disk), an optical disk(including a CD-ROM (Compact Disc-Read Only Memory) and a DVD (DigitalVersatile Disc)), or a magneto-optical disk (including an MD (MiniDisk)), or a ROM, a hard disk or the like in which the program isrecorded and which is provided to a user in a state wherein the programis incorporated in a computer.

It is to be noted that, in the present specification, the steps whichdescribe the program recorded in a recording medium may be but need notnecessarily be processed in a time series in the order as described, andinclude processes which are executed in parallel or individually withoutbeing processed in a time series.

INDUSTRIAL APPLICABILITY

As described above, according to the present invention, marks can berecorded and reproduced with a high degree of accuracy onto and from arecording film L0 layer and a recording film L1 layer of a two-layerrecording-reproduction optical disk.

1. A recording and/or reproduction apparatus for recording orreproducing data onto or from an optical disk having a first recordinglayer and a second recording layer on one side thereof, the second layerhaving a pre-formatted header, comprising: recording means forirradiating a laser beam upon the optical disk to record marks onto thefirst or second recording layer; light receiving means for receivingreflected light from the optical disk when the laser beam is irradiatedupon the optical disk; data signal production means for producing a datasignal based on the reflected light received by said light receivingmeans; and control means for controlling said recording means to recordmarks for a header and marks for data on the first recording layerbefore marks for data are recorded on the second recording layer whichhas marks for a header already formed thereon, the marks for the headerincluding a segment mark, marks corresponding to a first address andmarks corresponding to a second address, and said control means controlssaid recording means to record the dummy marks onto the first recordinglayer after recording the marks for the header.
 2. The recording and/orreproduction apparatus according to claim 1, wherein the optical disk isformed such that the laser beam irradiated upon the second recordinglayer and the reflected light from the second recording layer passthrough the first recording layer.
 3. The recording and/or reproductionapparatus according to claim 1, wherein said control means controls saidrecording means to record the marks corresponding to recording datainputted thereto onto the entire first recording layer prior to thesecond recording layer.
 4. The recording and/or reproduction apparatusaccording to claim 1, wherein wobbles are formed on tracks of the firstand second recording layers of the optical disk.
 5. The recording and/orreproduction apparatus according to claim 1, further comprising: wobblesignal production means for producing a wobble signal corresponding tothe wobbles formed on the tracks based on the reflected light signal;and adjustment means for adjusting a synchronizing signal based on thewobble signal.
 6. The recording and/or reproduction apparatus accordingto claim 1, wherein the first and second address data includes a trackaddress, a segment address and a CRC code.
 7. A recording and/orreproduction method for a recording and/or reproduction apparatus forrecording or reproducing data onto or from an optical disk having afirst recording layer and a second recording layer on one side thereof,the second layer having a pre-formatted header, comprising: irradiatinga laser beam upon the optical disk to record marks onto the first orsecond recording layer; receiving reflected light from the optical diskwhen the laser beam is irradiated upon the optical disk; producing adata signal based on the reflected light received; and controlling theirradiation to record marks for a header and then marks for data on thefirst recording layer before marks for data are recorded on the secondrecording layer which has marks for a header already formed thereon, themarks for the header including a segment mark, marks corresponding to afirst address and marks corresponding to a second address, and,recording dummy marks onto the first recording layer after recording themarks for the header.
 8. The recording and/or reproduction methodaccording to claim 7, wherein the first and second address data includesa track address, a segment address and a CRC code.
 9. A computerreadable medium, including computer program instructions for causing acomputer to implement a method of recording or reproducing data onto orfrom an optical disk having a first recording layer and a secondrecording layer on one side thereof, the second layer having apre-formatted header, comprising: irradiating a laser beam upon theoptical disk to record marks onto the first or second recording layer;receiving reflected light from the optical disk when the laser beam isirradiated upon the optical disk; producing a data signal based on thereflected light received; and controlling the irradiation to recordmarks for a header and then marks for data on the first recording layerbefore marks for data are recorded on the second recording layer whichhas marks for a header already formed thereon, the marks for the headerincluding a segment mark, marks corresponding to a first address andmarks corresponding to a second address, and, recording dummy marks ontothe entire first recording layer after recording the marks for theheader.
 10. The computer readable medium according to claim 9, whereinthe first and second address data includes a track address, a segmentaddress and a CRC code.
 11. An apparatus for recording or reproducingdata onto or from an optical disk having a first recording layer and asecond recording layer on one side thereof, the second layer having apre-formatted header, comprising: a recorder configured to irradiate alaser beam upon the optical disk to record marks onto the first orsecond recording layer; a light receiving mechanism configured toreceive reflected light from the optical disk when the laser beam isirradiated upon the optical disk; a data signal production mechanismconfigured to produce a data signal based on the reflected lightreceived by the light receiving mechanism; and a controller configuredto control the recording mechanism to record marks for a header andrecord marks for data on the first recording layer before marks for dataare recorded on second recording layer which has marks for a headeralready formed thereon, the marks for the header including a segmentmark, marks corresponding to a first address and marks corresponding toa second address, and said control means controls said recording meansto record the dummy marks onto the first recording layer after recordingthe marks for the header.
 12. The apparatus of claim 11, wherein theoptical disk is formed such that the laser beam irradiated upon thesecond recording layer and the reflected light from the second recordinglayer pass through the first recording layer.
 13. The apparatus of claim11, wherein the controller is configured to control the recordingmechanism to record the marks for the data input thereto onto the entirefirst recording layer prior to the second recording layer.
 14. Theapparatus according to claim 11, wherein wobbles are formed on tracks ofthe first and second recording layers of the optical disk.
 15. Theapparatus of claim 11, further comprising: a wobble signal productionmechanism configured to produce a wobble signal corresponding to wobblesformed on tracks based on the reflected light signal; and an adjustmentmechanism configured to adjust a synchronizing signal based on thewobble signal.
 16. The apparatus according to claim 11, wherein thefirst and second address data includes a track address, a segmentaddress and a CRC code.